[gnome-backgrounds] README: smaller image

[Jakub Steiner <jimmac src gnome org>]

commit 23a87b3a2f28695c3710404dc8820c9099d0cba5
Author: Jakub Steiner <jimmac gmail com>
Date:   Thu Jun 11 09:51:06 2020 +0200

    README: smaller image

 README.md    |   2 +-
 defaults.jpg | Bin 510287 -> 186830 bytes
 2 files changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/README.md b/README.md
index 717f9ac..61c8b85 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ The default wallpaper has historically been strictly abstract, low contrast and
 
 It is desirable to have a wide mix of themes and colors for the additional wallpapers. Photographs and 
illustrations that would otherwise be too contrasty and with high frequency detail to be a good backdrop are 
perfectly suitable. Photos should generally be at least 3840x2160px, with no artifacts such as chromatic 
aberation. Generally 16:9 aspect ratio is preferred as the wallpapers get scaled with the `background-size: 
cover` equivalent method and wide displays are becoming more and more common.
 
-### Low fidelity and size constraints
+### Low Fidelity and Size Constraints
 
 One wallpaper is reserved for plain color to be used for remote access where it's benefitial for the 
compression algorith to cope with it with ease. Unfortunately due to distribution limits, the background 
collection has to keep its size contrained to around 40MB. This forces us to replace assets rather than add 
them. You can download the [Nostalgia](https://flathub.org/apps/details/im.bernard.Nostalgia) app to view 
previous release wallpapers.
 
diff --git a/defaults.jpg b/defaults.jpg
index 42dcf93..c459358 100644
Binary files a/defaults.jpg and b/defaults.jpg differ